Incandescent lamp and method of manufacture the same



Feb. 25, 1936. R. F. STRICKLAND 2,032,232

INCANDESCENT LAMP AND METHOD OF MANUFACTURING THE SAME 2 Sheets-Shet 1Filed July 13, 1932 my r IAZ-VENTUR ROYAL F STRZ'EKLAN-D,

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20 and the description which follows of a Patented Feb. 25, 1936 PATENTOFFICE INCANDESOENT LAMP AND METHOD OF MANUFACTURING'THE SAME Royal F.Strickland, Cleveland Heights, Ohio, assignor to General ElectricCompany, a corporation of New Ycrk Application July 13, 1932, Serial No.622,268

Claims. (01. 176-32) My invention relates to bases for electricincandescent lamps and similar devices. More par-. ticularly myinvention relates to such devices having bases which are comprised ofinsulating 5 material molded directly thereon and are provided withmetallic contact areas or terminals.

. Previous bases of this type usually incorporated relatively largeterminal portions. .In some cases i this was due to the fact that theinsulating material was rather brittle and required protection. In somecases metallic paste or paint coatings served for the terminals. Myinvention on the other hand contemplates terminals consisting of bodiesof metal as distinct from such coatings. One object of my invention isto provide an efiicient base comprising parts of small size and low costbut of great durability as compared with previous bases. Other objectsand advantages of my invention will appear from the drawings speciesthereof.

In the drawings Fig. 1 is a perspective view of b Fig. 5 isa perspectiveview of another species of my invention; Figs. 6, 8 and 10 are verticalsections through a portion of still other species of my invention; andFigs. '7, 9 and 11 are horizontal sections along lines 66, 8-8, andIll-l ll respectively of the species shown in Figs. 6, 8 and 10.

In the specific embodiment of my invention shown in Fig. 1, the basecomprises collar Ill and a substantially cylindrical portion II withoppositely disposed lateral ridges l2 extending longitudinally thereof.These portions are all formed from the molded material which ispreferably composed principally of a synthetic resin, a hardeningcompound and a filler such as marble flour or the like. There are anumber of such synthetic resins such as Bakelite. One such syntheticresin is commercially known as Durite which is a furfural or phenolformaldehyde product. This substance is preferred for its resistance arecontact areas or terminals l3'c0nnected to a hardening compound such ashexamethylenefilament H and, in the species shown in Fig. 1, are exposedportions of the leads l5 which are suitably bent preferably into loops.When the base is inserted into a socket is, shown in Fig. 2, the contactareas are engaged. by spring contact fingers I'l in longitudinal grooves18 in the socket which guide the ridges l2 into position and thecylindrical portion ll of the base is snugly engaged by acorrespondingly shaped portion of the socket. Sockets of this type havesufficient grip upon the base to keep the lamp from being shaken out. AV

' My method of molding the species shown in Fig. 1 consists, as shown inFigs. 3 and 4, in first bending the outer ends is of the leading-inwires into the form shown and placing the lamp in holder 28. The holderis provided with a sponge rubber facing it so as to engage all portionsof the irregular shaped bulb 22. The mold 23 is then brought down intocontact with the bulb in such a position that the leading-imwires willbe properly placed in the mold whereupon the required amount of moldingmaterial is inserted into passage 26 and is pressed into all portions ofthe mold by plunger 25. The'mold is now heated, preferably to 0., untilthe base material has taken a permanent set whereupon the bulb holder 2Bis removed and the completed based lamp removed from the mold. In orderto prevent breakage of the bulbs, a molding pressure of from fifteen toone hundred and fifty pounds per square inch is used, which issufficient for the molding material used. With this method ofmanufacture the base terminals are sections of the leading-in wires eachof which is bent into the looped form shown. This provides the twooppositelydisposed terminals and serves also to resist displacementduring the molding process.

Also included within the scope of my invention are the other forms of mybase shown in remaining Figs. 5 to 11 which comprise separate terminalsunited to the leads. The inserts 26, as

inserts differs in that said wires are soldered or welded thereto beforethe base is molded. In

' method of attaching the leading-in wires to the the iorm shown inFigs. and 11, the leadingin wires are clamped to the insert by bendingtongue 21 thereabout, as shown, before molding.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

the said enclosure and avbase consisting of an insulating substancemolded on said enclosure and having embedded therein the ends of saidlead wires, said base having at least one longitudinally extendingprotuberance at the side thereof formed from said insulating materialand having a portion of one of saidlead wires exposed at the surfacethereof to constitute a terminal.

2. An electrical device consisting of a glass enclosure having anelectric energy translation element mounted therein and lead wiresconnected to said element and extending through the said enclosure and abase consisting of an insulating substance molded on said enclosure andhaving embedded. therein the ends 01 said lead wires, said base havingat least one longitudinally extending protuberance at the side thereofformed from said insulating material and having a terminal body exposedat the surface thereof having electrical connection to one of said leadwires.

I 3. An electrical device consisting 01' a glass en closure having anelectric energy translation element mounted therein and lead wiresconnected to said element and extending through the said enclosure and acylindrical base consisting of enclosure having anelectric energytranslation element mounted therein and lead wires, connected to saidelement andiextending through the said enclosure and a cylindrical baseconsisting of an insulating substance molded on said enclosure andhaving embedded therein the ends'of said lead wires, said base having atleast one longitudinally extending ridge at the P side thereof formedfrom said insulating material.

and having a portion of a lead wire exposed and extending along aportion. of the surface thereof to constitute a terminal.

5. An electrical device consisting of a glass enclosure havingan'electric energy translation element mounted therein and leadwires.connected to said element and extending through said enclosure,and a base consisting of an insulating substance molded on saidenclosure and having embedded therein the ends of said lead wires, saidbase having at least one longitudinaily extending protuberance at theside thereoi, and the embedded end of a lead wire being bent into anangular loop extending outward from the wall of said enclosure andhaving its midportion exposed at the surface of said protuberance toconstitute a'terminal. ROYAL 1". 'BTRICKLAND.

